Finding the Fourth Proportional to 12,405.72, 18,607.86 and 3,171

Step by Step Solution

1. Step 1: Write the proportion equation
   12,405.72 : 18,607.86 = 3,171 : x
2. Step 2: Convert to fraction form
   12,405.72/18,607.86 = 3,171/x
3. Step 3: Cross multiply
   12,405.72x = 18,607.86 × 3,171
4. Step 4: Simplify right side
   12,405.72x = 59,005,524.06
5. Step 5: Solve for x
   x = 59,005,524.06/12,405.72
6. Step 6: Final answer
   x = 4,756.32